TY - BOOK AU - Shelly, Gary B;Cashman, Thomas J;Serwatka, Judy A. TI - Business data communications: intriductory concepts and techniques: Intriductory concepts and techniques SN - 9788131503324 U1 - 004.65 SHEG PY - 2009/// CY - New Delhi PB - Cengage Learning KW - None ER -